Straight-line number

A number $n>99$ is said to be straight-line if its digits form an arithmetic progression.

Examples

123, 333 and 642 are all straight-line, with the steps being 1, 0 and -2.

Properties

• The digits of the numbers are either of the same parity (for even steps) or alternating (for odd steps).

External links

• straight-line numbers - Numbers Aplenty

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